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Related Concept Videos

Two-dimensional Gel Electrophoresis01:22

Two-dimensional Gel Electrophoresis

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Two-dimensional gel electrophoresis is a high-resolution protein separation method first introduced by O' Farrell and Klose in 1975. This method involves protein separation by two dimensions, mass and charge, making it more accurate than one-dimensional gel electrophoresis.
The first dimension separation uses the isoelectric focusing or IEF technique performed on immobilized pH gradient (IPG) strips that separate proteins according to their isoelectric points.
Biological samples, such...
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Electrophoresis: Overview01:20

Electrophoresis: Overview

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Electrophoresis is a powerful analytical separation technique that relies on the differential migration of charged species when subjected to an electric field. The core strength of electrophoresis lies in its ability to separate high-molecular-weight species in complex mixtures. It has found widespread use in biochemistry, molecular biology, and analytical chemistry, allowing the separation of compounds like amino acids, nucleotides, carbohydrates, and proteins with excellent resolution.
There...
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SDS-PAGE01:27

SDS-PAGE

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Gel electrophoresis is a method that separates biological macromolecules like nucleic acids or proteins by forcing them to pass through a gel matrix under an electric field.
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DNA Agarose Gel Electrophoresis02:35

DNA Agarose Gel Electrophoresis

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Agarose gel electrophoresis is a laboratory technique commonly used to separate DNA fragments by size. However, it can also be used to isolate and purify DNA fragments using a gel extraction protocol.
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Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
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Two-Dimensional Microscopy in Microbiology01:29

Two-Dimensional Microscopy in Microbiology

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Two-dimensional (2D) microscopy encompasses a range of optical techniques that capture images within a single focal plane, offering detailed representations of microscopic structures. These techniques are essential in biological and medical research, enabling the visualization of cellular and subcellular structures with different levels of contrast and specificity.There are several major types of 2D microscopy, each with strengths and applications.Bright-Field MicroscopyBright-field microscopy...
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Updated: Aug 21, 2025

Selective Labelling of Cell-surface Proteins using CyDye DIGE Fluor Minimal Dyes
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Comparative Two-Dimensional Fluorescence Gel Electrophoresis.

Doreen Ackermann1, Simone König2

  • 1Interdisziplinäres Zentrum für Klinische Forschung, IZKF Core Unit Proteomics, University of Münster, Münster, Germany.

Methods in Molecular Biology (Clifton, N.J.)
|November 15, 2022
PubMed
Summary
This summary is machine-generated.

Two-dimensional comparative fluorescence gel electrophoresis (CoFGE) enhances protein analysis reproducibility. This method is crucial for comparing samples lacking replicates, offering an alternative to differential gel electrophoresis (DIGE).

Keywords:
2D-PAGEComparative fluorescence gel electrophoresisProtein coordinatesProtein gridQuantificationhCoFGE

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Area of Science:

  • Proteomics
  • Biochemistry
  • Analytical Chemistry

Background:

  • Reproducible protein spot coordinate assignment is vital for comparative proteomics.
  • Differential gel electrophoresis (DIGE) requires replicates, limiting its use for certain sample types.
  • Gel-to-gel variability poses challenges in analyzing 2D polyacrylamide gels.

Purpose of the Study:

  • To introduce and validate two-dimensional comparative fluorescence gel electrophoresis (CoFGE) as a reproducible method for protein analysis.
  • To provide a technique for comparing protein samples when replicates are unavailable.
  • To offer an alternative to DIGE for comparative proteomic studies.

Main Methods:

  • CoFGE utilizes an internal standard, a marker grid of purified proteins, co-run with the sample proteome.
  • Two fluorescent dyes differentiate reference and analyte spots.
  • Marker grid corrects for variations in molecular weight (y-dimension) and optionally pI (x-dimension) using azo-dyes.
  • Experiments can be performed in vertical or horizontal electrophoresis devices, with horizontal CoFGE being simpler.

Main Results:

  • CoFGE significantly increases the reproducibility of coordinate assignment for protein spots.
  • The method allows for direct comparison of samples without replicates.
  • The CoFGE principle is adaptable for protein quantification.
  • Commercial software is available for data analysis.

Conclusions:

  • CoFGE is a robust and reproducible technique for comparative proteomic analysis, especially when replicates are not feasible.
  • It overcomes limitations of DIGE by not requiring sample replication.
  • The method offers flexibility in experimental setup and is suitable for protein quantification.